Yamaha Grizzly Dyno Results with HMF Slip-on

[Mobile Dyno]

I installed a HMF Slip-on, Dynojet Jet Kit, and a TwinAir filter on an 04' Grizzly 660.

[Mobile Dyno]

The TwinAir:)

[Mobile Dyno]

We started with dynoing the bike completely stock. Then we installed the HMF slip-on, Dynojet jet kit(with the recommended jetting specs), and the TwinAir. The graph shows the comparison.

[Mobile Dyno]

The tq gain was good

[Mobile Dyno]

Top speed

[Mobile Dyno]

We finished the jetting with 160 main and the needle in the 4th position. The day of the test the temp was 55* and the humidity was 26%. The altitude was 312ft.Our dyno is in a trailer so we can tune to outside(real time) conditions. :D

[Mobile Dyno]

Stock main was a 153.8 and Dynojet recommends a 155. From what I have seen before I jumped to a 160 and the result was right on the reference line. This is why the air/fuel module is such a great tool.:) Overall I think that with the mods that were installed we gained some usable power.

[bman9]

sweet deal!



<img src="http://www.autocentre.ua/ac/03/52/images/19/Yamaha-grizzly.jpg">

[Admin]

Awesome Information!!

[Mobile Dyno]

Thanks for the reply's :) Nice bike bman

[kamikaze_rzrbak]

youll be a great addition to the site

[Mobile Dyno]

Thanks Rzrbak:)

[tom400ex]

Awesome review:D :D
This is the info I've been waiting for. I also have a '04 grizzly and I'm getting from my girlfriend a HMF Penland Series Exhaust for christmas
(I love her:D )

And I've been to a bunch of utility sites looking for some dyno info and could not find any that compair to this. Not even on Hmf's site.

I didn't get the twin air filter should I put in on my christmas list too???

[Mobile Dyno]

Tom Thanks for the reply. Yes I would recommend the TwinAir. It flows better than stock and protects better than K & N. I'm working on getting more info for everyone. I sent you a pm:D

[kamikaze_rzrbak]

maybe you can do some pipe shootouts with differnent quads, if you did you would have a lot of friends on this site

[TANK]

I wanted to let everyone know that Mobile Dyno installed their High Performance Package on my Rincon and I could not be happier with the service and PERFORMANCE that i gained. Thanks again Dyno Guys. When I figure out how to attach a pic i will.

[tom400ex]

I ordered a penland series like 3 weeks ago. Well i placed the order and my girlfriend called back and bought it for me for christmas. I got it directly from HMF.

Just curious on prices cause I have two other friends with grizzlys and I sure once I bold my pipe on the will want one.

[RIDER11X]

Great info! But, I must admit I was shocked at the HP readings on the dyno! It has about the same as a stock 400ex, but the move out really well for weighing 600lbs.. I guess as they say, it is in the torque numbers.
Great job on the review!!!!;)

[Mobile Dyno]

Thanks Rider11x:)

[RIDER11X]

After more thought, the HP readings aren't all that shocking, as the Raptor is about 34HP stock, and you subtract a little for the CVT tranny, and there you go.
Out of curiosity, what are the torque numbers on a stock 400ex for comparision?:confused: